Solar-light induced photocatalytic-persulfate activity of BiOCl0.5I0.5/ NH2-MIL-88B(Fe) for tetracycline hydrochloride degradation

Photocatalysis coupling with persulfate advanced oxidation is a promising route to eliminate antibiotics from wastewater. BiOCl0.5I0.5 combined with NH2-MIL-88B(Fe) (BCI/NM-88B) heterojunction was constructed for enhancing the photocatalytic-persulfate activity toward tetracycline hydrochloride (TCH). The junction between BiOCl0.5I0.5 and NH2-MIL-88B(Fe) favored the separation and transfer of photo-induced e /h+ pairs, boosting the visible-light utilization. Compared with BiOCl0.5I0.5 and NH2-MIL-88B(Fe), BCI/NM-88B exhibited the better removal efficiency of TCH. The optimal 3-BCI/NM-88B could remove 91.15 % TCH solution of 120 mg L  1 within 120 min, and declined to 85.86 % after five cycles. The photo-corrosion and the residue coverage leaded to the deactivation of 3-BCI/NM-88B. SO4 & BULL; and & BULL;OH radicals were the vital radicals in 3-BCI/NM-88B-assisted photocatalytic-persulfate system.

Automated summary

Photocatalysis coupled with persulfate advanced oxidation is an effective method for removing antibiotics from wastewater. The construction of a BiOClO.5I0.5 and NH2-MIL-88B(Fe) heterojunction enhanced the photocatalytic-persulfate activity towards tetracycline hydrochloride (TCH). The combination facilitated the separation and transfer of photo-induced e- /h+ pairs, resulting in improved utilization of visible light. The BCI/NM-88B heterojunction exhibited better removal efficiency of TCH compared to BiOClO.5I0.5 and NH2-MIL-88B(Fe).